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IEEE 299 Shielding Effectiveness

IEEE 299 is the standard method for measuring the effectiveness of electromagnetic shielding enclosures. The shielding effectiveness testing occurs at frequencies from 9 kHz to 18 GHz (extendable to 50 Hz and 100 GHz, respectively) for enclosures having all dimension greater than or equal to 2.0 m. The types of enclosures covered include, but are not limited to, single-shield or double-shield structures of various construction, such as bolted demountable, welded, or integral with a building; and made of materials such as steel plate, copper or aluminum sheet, screening, hardware cloth, metal foil, or shielding fabrics.

Testing to IEEE 299 requires placing transmitting and receiving loops approximately 0.3 m from the respective shielding barrier. The generator output is maintained at the level used during the reference measurement and is applied at each frequency and location. During all low-frequency measurements, one loop remains in a fixed position and the second loop is repositioned and displaced to seek a worst-case measurement. The maximum indication of the detector reading shall be used for determining the shielding effectiveness.

Keystone Compliance has developed an expertise in conducting shielding effectiveness testing to IEEE-299. With five EMC chambers, including multiple shielding effectiveness setups, there is a short lead time on scheduling. Plus, having conducted hundreds of shielding effectiveness test programs has provided our staff with significant insight on enclosure and material design. When needed, our engineers assist manufacturers with not just identifying failures, but helping to find solutions. This consultative approach has driven Keystone Compliance to be recognized as one of the fastest-growing companies in the country.

Please contact us to receive a quote for your IEEE 299 shielding effectiveness testing need.